heres one i have never had-- bike is a 1200cc small cam -- when the bike is warmed up/hot if you shake the bike side to side it causes an erratic idle to the point it almost kills -- opened the gas caps -- cleaned the bowl - cleaned all the insides and jets and passages --

the bike starts super good -- idles till it gets up to temp -- rides really well slow/high speed -- no cough/spit ect..

 

Floats off a bit from the sounds of it , don't take much .